using System.IO;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Driver.AbLegacy;
using ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.PlcFamilies;

namespace ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Tests.Import;

/// <summary>
///     Coverage for <see cref="AbLegacyDriverFactoryExtensions.AddRsLogixImport"/> — the
///     extension method that opens a CSV file and concatenates the resulting tag definitions
///     onto an existing <see cref="AbLegacyDriverOptions"/>.
/// </summary>
[Trait("Category", "Unit")]
public sealed class AbLegacyDriverFactoryAddRsLogixImportTests
{
    [Fact]
    public void AddRsLogixImport_appends_tags_and_preserves_existing_options()
    {
        // Existing options have one device + one hand-rolled tag. The importer should
        // append on top — never replace — so the device + the original tag survive.
        var path = Path.Combine(Path.GetTempPath(), $"rslogix-import-{Guid.NewGuid():N}.csv");
        File.WriteAllText(path, """
            Symbol,Address,Description,DataType,Scope
            New1,N7:0,desc,INT,Global
            New2,F8:0,desc,REAL,Global
            """);
        try
        {
            var existingTag = new AbLegacyTagDefinition(
                Name: "Manual",
                DeviceHostAddress: "ab://10.0.0.1/1,0",
                Address: "S:0",
                DataType: AbLegacyDataType.Int);
            var options = new AbLegacyDriverOptions
            {
                Devices = [new AbLegacyDeviceOptions("ab://10.0.0.1/1,0", AbLegacyPlcFamily.Slc500)],
                Tags = [existingTag],
            };

            var updated = options.AddRsLogixImport(path, "ab://10.0.0.1/1,0", out var result);

            // Imported counts surface on the result.
            result.ParsedCount.ShouldBe(2);

            // Devices + the original Manual tag are preserved on the returned options.
            updated.Devices.Count.ShouldBe(1);
            updated.Tags.Count.ShouldBe(3);
            updated.Tags[0].Name.ShouldBe("Manual");
            updated.Tags[1].Name.ShouldBe("New1");
            updated.Tags[2].Name.ShouldBe("New2");

            // Original options object is unchanged (immutability guarantee).
            options.Tags.Count.ShouldBe(1);
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }

    [Fact]
    public void AddRsLogixImportWithResult_returns_tuple()
    {
        var path = Path.Combine(Path.GetTempPath(), $"rslogix-import-{Guid.NewGuid():N}.csv");
        File.WriteAllText(path, """
            Symbol,Address,Description,DataType,Scope
            T,N7:0,desc,INT,Global
            """);
        try
        {
            var options = new AbLegacyDriverOptions();
            var (updated, result) = options.AddRsLogixImportWithResult(path, "ab://10.0.0.1/1,0");
            result.ParsedCount.ShouldBe(1);
            updated.Tags.Count.ShouldBe(1);
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }
}